Grinding attachment for lathes



G. M. SHERMAN:

GRINDING ATTACHMENT FOR LATHES.

APPLICATION FILED SEPT. 28, 1920.

Patented July 26, 1921.

tachable tool cla mam OFFICE.

GEORGE M; SHERMAN, 0F TAHLE'QUAH, OKLAHOMA.

GRINDING ATTACHMENT non reruns.

To all whom it may concern j Be it known that I, GEORGE M. SHERMAN, a citizen of the United States of America, andresident of Tahlequah, in the county of Cherokee and State of Oklahoma, have invented certain new and useful Improvements in Grinding Attachments for Lathes, of which the following is a specification.

This invention relates to abrading or grinding devices and has relation particularly to an attachment whereby a lathe or other machine of like character may be utilized as a grinding machine. I An object of this invention is to provide novel means attachably connected to a bed plate or other element of a lathe or the like so that the attachment may he slid longitudinally of the bed plate for moving the blade or element being ground or sharpened into position so that the blade will be ground uniformly throughout its length.

The invention, therefore, includes a dep having means whereby the tool clamp may be reciprocated parallel to the axis of the grinding disk without liability of Variation in the pressure of the tool against the grinding disk so that the cutting edge of the tool will be uniformly sharpened expeditiously and to better effect than can be done by hand operation. 7

A device made in accordance with this invention will prove economical in that a spe cial grinder need not be installed in small shops but the invention makes it possible to convert a machine which is a part of the standard equipment of such shops into a grinder, the same being accomplished at comparatively small cost, especially when the cost of grinding machines is taken into account.

With the foregoing and other objects in view, the invention consists in the details of construction, and in the arrangement and combination of fully set forth and claimed.

In describing the invention in detail, reference will be had to the accompanying drawings forming part of this specification wherein like characters denote corresponding parts in the several views, and in whic Figure 1 illustrates a view n perspective of a fragment of a rail of a bed plate and a fragment of a driving spindle of a lathe,

v Specification of LettersPatent- P t t d Application filed September as, 1 92( $eria1 nogeiaass.

parts to be hereinafter more showing the grinding disk and the traveling tool clamp associated therewith, and

Fig. 2 illustrates a transverse sectional View of the traveling tool clam ()ne skilled in the art will, it is thought, understand that the usual guide or rail 5 of a lathe is of the general contour of that shown in the drawing, whereas the work holder comprises a base 6, which in cross section, has the contour of the. element on which it is to slide. The base has an upstanding hollow boss 7 in which a set screw 8 is threaded for adjustably holding the pivot or pin 9 of the guide 10 in different positions of adjustment. The guide 10 in the present embodiment of the invention is of the general contour in cross section of the base 6 in an inverted position.

The work clamp proper, identified by the reference character 1l,'has a diagonally disposed seat 12 in its upper surface intended to receive the blade 13 which is to be sharpened, and the blade is held in the seat by clamping screws 14 which are threaded in the clamp. The clamp has a T-shaped flange 15 at its lower side which fits in the guide 10 and is adapted to travel therein, so that by reason of the adjustment of the base 6 on the bed plate and the travel of the clamp 11 in the guide 10, provision is made forrather wide range of movement of the blade with relation to the grinding disk 16 which may be secured on a 17 which may be connected the lathe (not shown.)

It is of course desirable that the joints between the reciprocating members be relatively tight or close to avoid lost motion or undue movement when pressure is applied during the grinding operation, but the attachment is, of course, removable so that the lathe may be used in the ordinary way after the grinding operation has been completed.

I claim:

1. A grinding attachment for machines including a lathe bed plate, a guiding element formed on the bed plate, a base mounted to moveon the guiding element, a hollow boss on the base, a stationary guide having a groove and having a pivot pin positioned for adjustment within the hollow boss, means for holding the pin in its positions of adjustment, a'work clamp having a T- head fitted in the groove to permit the work to the head of July 26, 19 21.

shank or spindle shim of the lathe, a detachable base "slidably said work clamp having a' of the work clamp,

mounted on the guide of the bed plate in operative relation to the grinding element, a work clamp, a guiding element in Which and with relation to which the work clamp is slidable,

and means for connecting the said member. tothe base, whereby the ment. with relation to the base.

a memberv connected'to the guide GEORGE M. SHERMAN;

said member has rotary and ertical adjust- 

